* Download Xcode 11 (distributed as .xip I think, double-click to unpack)
* Rename to Xcode-11.app so it doesn't clash with Xcode.app
* Move to /Applications
* Run "xcode-select -p /Applications/Xcode-11.app/Contents/Developer" to 
switch

On Monday, September 21, 2020 at 6:59:26 PM UTC+2 Matthias Koeppe wrote:

> You can try to downgrade your Xcode command line tools to 11.x, for 
> example using this:
>
>
> https://download.developer.apple.com/Developer_Tools/Command_Line_Tools_for_Xcode_11.5/Command_Line_Tools_for_Xcode_11.5.dmg
>
>
>
> On Monday, September 21, 2020 at 9:14:11 AM UTC-7 anne1.s...@gmail.com 
> wrote:
>
>> Ok, thanks for letting me know. Does that mean I can now not work on 
>> tickets that are based on the latest develop branch?
>>
>> Anne
>>
>> On Monday, September 21, 2020 at 8:58:18 AM UTC-7 Matthias Koeppe wrote:
>>
>>> Hi Anne,
>>> This is from the new Xcode 12 that probably came with a system update.
>>> https://trac.sagemath.org/ticket/30494 tracks the progress of fixing 
>>> Sage to support the new Xcode version.
>>> Matthias
>>>
>>>
>>> On Monday, September 21, 2020 at 8:51:35 AM UTC-7 anne1.s...@gmail.com 
>>> wrote:
>>>
>>>>
>>>> Dear All,
>>>>
>>>> I am having trouble again to build the latest develop branch on MacOS 
>>>> 10.15.6. The log files can be found at 
>>>>
>>>> https://www.math.ucdavis.edu/~anne/config.log
>>>> https://www.math.ucdavis.edu/~anne/gf2x-1.3.0.log
>>>>
>>>> Best wishes,
>>>>
>>>> Anne
>>>>
>>>>
>>>>

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